JfreeChart Gantt Chart double values

for a project at my university i have to show some data in a Gantt Chart. The chart should look like this when its finished.

chart example

For the x-axis i just need a numeric bar which i could implement. However i have some issues creating the datasets for the chart. As far as i can see i need a Taskseries for this kind of chart.

However the values i want do display are no dates, they are just double values. For example product j starts at 2.150 and ends at 10.241.
I am not able to create a task with double values. The best i could do was to create a task with a int value for start and duration. For example product j starts at 2 and ends at 10.

Is there a possiblity to create some kind of category data set which uses double values for the start and duration time? If you need any more information just let me know. Thanks in advance.

Source: java

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